TY - JOUR
T1 - A quasi-elastic neutron scattering (QNS) study
AU - Petry, W.
AU - Vogl, G.
AU - Heidemann, A.
AU - Steinmetz, K. H.
AU - Vogl, G.
N1 - Funding Information:
The authors first wish to thank Th. Flottmann for extensive experimental help. They are also grateful to G. M. Hood for providing zirconium from which one of the specimens was melted, and to W. Miekeley and W. Roennfeldt who produced all Zr-Co alloys and E. Nembach for performing the microprobe analysis. They further thank Ch. Herzig for calling their attention to the Zr-Co system and for numerous discussions during the course of the experiments, and K. Schroeder for discussion on the exchange model. This work was partly funded by the Bundesministerium fur Forschung und Technologie, Federal Republic of Germany under contract 03- B72A37-1 .
PY - 1987/2
Y1 - 1987/2
N2 - Quasi-elastic line broadening of neutrons scattered from 2at.%Co alloyed in β-Zr shows that at about 1100°C all Co atoms, not merely a small fraction, participate in fast diffusion of Co in Zr within a time interval of 10−9s. In the measured temperature range of 950 to 1380°C the deduced jump frequency is about 20 times faster than that of Zr in Zr-2 at.% Co but 8 times smaller than the Co jump frequency deduced from tracer measurements. This discrepancy, an anomalous decrease in intensity, and quasi-elastic neutron measurements at larger energy transfer indicate that a second jump frequency 30 times faster than the first one exists. From a comparison of all available experimental data it is inferred that the slower jump is either via vacancies between substitutional sites or a release jump from a trap, and it is concluded that the faster jump is between interstitial sites.
AB - Quasi-elastic line broadening of neutrons scattered from 2at.%Co alloyed in β-Zr shows that at about 1100°C all Co atoms, not merely a small fraction, participate in fast diffusion of Co in Zr within a time interval of 10−9s. In the measured temperature range of 950 to 1380°C the deduced jump frequency is about 20 times faster than that of Zr in Zr-2 at.% Co but 8 times smaller than the Co jump frequency deduced from tracer measurements. This discrepancy, an anomalous decrease in intensity, and quasi-elastic neutron measurements at larger energy transfer indicate that a second jump frequency 30 times faster than the first one exists. From a comparison of all available experimental data it is inferred that the slower jump is either via vacancies between substitutional sites or a release jump from a trap, and it is concluded that the faster jump is between interstitial sites.
UR - http://www.scopus.com/inward/record.url?scp=0023294685&partnerID=8YFLogxK
U2 - 10.1080/01418618708209844
DO - 10.1080/01418618708209844
M3 - Article
AN - SCOPUS:0023294685
SN - 0141-8610
VL - 55
SP - 183
EP - 201
JO - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
JF - Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties
IS - 2
ER -